Now I do need to rebuild the test sub box shown, I was going to go with the keystone shape, PR in the back.

This design has a 1.75db rise at 34hz, according to computer modeling. Now if there was a fellow that was wizard in WinISD, I'd sure like to know if I should go with a slightly bigger box. (existing box 1.16cf, tuned at 33hz)

Now I do need to rebuild the test sub box shown, I was going to go with the keystone shape, PR in the back.

This design has a 1.75db rise at 34hz, according to computer modeling. Now if there was a fellow that was wizard in WinISD, I'd sure like to know if I should go with a slightly bigger box. (existing box 1.16cf, tuned at 33hz)

The 8 speaker baffle board would have to be behind the 9 outside board.

Really? Whatever keeps the OCD twitch at bay man.

If you think about it the sides are braced every 3"-7", so 1/2" material is more than adequate IMO. You could always build in ply, but no need really. I'd save the good stuff for something down the line once you get a handle on what you want from a TH.

If you get your handle changed it should be Verdana:

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[FONT=Verdana]Dan, I thought I would build the TH project next; the illustration is a little off, I think. [/FONT]
[FONT=Verdana] [/FONT]
[FONT=Verdana]The 8 speaker baffle board would have to be behind the 9 outside board.[/FONT]
[FONT=Verdana] [/FONT]
[FONT=Verdana]Also, was considering using Ύ mdf for the 20 x 24-3/4 sides. The 9 boards would be need to be ½ wider.[/FONT]
[FONT=Verdana] [/FONT]
[FONT=Verdana]Looks like fun, thanks.[/FONT]

I Just bought 4 of these because of this thread, I would love to see someone design a TH for these, I saw the pictures posted of one using 2 of these, but maybe we can designate a thread for this on its own... The only TH I have built is JBells ss15, I have 4 of them, I would love to make some of these for smaller home parties.

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The best DJ in Houston using the SS15 born in diyAudio from Jbell and the rest of the community!!

I Just bought 4 of these because of this thread, I would love to see someone design a TH for these, I saw the pictures posted of one using 2 of these, but maybe we can designate a thread for this on its own... The only TH I have built is JBells ss15, I have 4 of them, I would love to make some of these for smaller home parties.

1-40Hz dual driver TH at full output with these drivers is roughly what you get out of a SS15 with a few watts. Why not build the jbell bass sticks with the 55-2421 for a small rig?